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RCMP were involved in a cross-border drug bust this summer that involved nearly 300 kilograms of meth, more than 100 guns and an aerial chase between a police aircraft and a helicopter.

Details of the bust are in paperwork filed at the Penticton Law Courts to support multiple search warrants for a property near Chilliwack where a helicopter at the centre of the chase is alleged to have landed.

Documents filed on behalf of the RCMP Federal Serious and Organized Crime Section in Osoyoos say the office was alerted in early June by U.S. Homeland Security about a planned cross-border drug deal involving nearly 200 kilograms of methamphetamine.

U.S. officials staked out a landing site in Washington state about 110 kilometres south of Princeton, where they believed the drugs would be transferred to Canadian buyers. Something spooked the pilot of the helicopter, and it fled north into Canadian airspace.

Two men who tried to leave the landing site in Washington were arrested by U.S. agents who seized 188 kilograms of methamphetamine.

In Canadian skies, an RCMP plane was patrolling near Princeton hoping to intercept the unmarked, black helicopter. Mounties spotted it in a shadowy landing site on a remote mountainside in Manning Park.

The helicopter lifted off, and the chase was on.

"The helicopter took deliberate evasive action, attempting to lose surveillance," the documents say. "The helicopter flew at very low altitudes, near the tops of trees and up narrow draws. It repeatedly changed direction, and made rapid ascents up towards the mountains.

"The helicopter varied its speed in an attempt to outrun the RCMP aircraft, and slowed down to have the RCMP aircraft overtake it."

The dogfight continued for 45 minutes, the documents say. On two occasions, the chopper pilot tried to lure the RCMP aircraft to a lower altitude and then rapidly ascended, in a vain effort to shake the pursuers.

The helicopter eventually landed at a rural property near Chilliwack. Court documents show searches of that property turned up 72 long guns, 35 handguns, ammunition, cellphone jammers, U.S. government helicopter decals, drones and currency from Canada, the U.S. and Mexico.

RCMP have not said if anyone has been charged and referred a request for comment to Homeland Security.

Homeland Security spokeswoman Tanya Roman said the investigation turned up an additional 84 kilograms of drugs, bringing the total amount of drugs seized to 272 kilograms.

Authorities believe the pilot was one of two men arrested at the Chilliwack-area property.

The Canadian Civil Aircraft Registry shows the helicopter's registration was cancelled last May.